求化学专业人士英语翻译The results of a series of consecutive TPR profil

求化学专业人士英语翻译
The results of a series of consecutive TPR profiles of fresh and aged catalysts are illustrated in Figure 1. For the fresh catalysts, all of the samples exhibit a dominate low-temperature reduction feature at ca. 65 °C (peak a)andthree small peaks denoted by b, c,anddappeared in the range of 150-400 °C. Previous investigations have
reported that palladium oxide is reduced to palladium on exposure to H2 at room temperature (22, 23). In addition, no characterization was observed below 150 °C in the TPR profiles of fresh supports (not shown), which further proves that peak a can be attributed to the reduction of PdO.
The results of classical TPR experiments for CeO2-ZrO2 mixed oxide show two peaks at 500 and 830 °C, which have been, respectively, attributed to reduction of the surface and the bulk (24). The three peaks in the range of 150-400 °C are also associated with reduction of the surface, and are assigned to reduction of small crystallites, the surface of larger crystallites and some subsurface reduction of the larger crystallites as reported (9, 16, 23). In fact, it was shown that the TPR behavior of these mixed oxides depends on different
factors such as pretreatment conditions, degree of sintering, and phase structure (25-27). In our previous study, we have found that the bulk reduction temperature of CeO2-ZrO2 solid solution increased with the increase of Zr content, and no bulk reduction occurred for Ce0.2Zr0.8O2 in the range of 30-1000 °C. Therefore, the absence of bulk reduction for the corresponding catalyst is easy to understand.
Based on the amount of H2 consumption observed over a standard CuO sample in similar TPR procedures, the amount of mobile oxygen reacted with H2 in the fresh and aged catalysts were estimated and the data are summarized in SI Tables S1 and S2, respectively.
In comparison with the TPR profile of the support, the presence ofPdproduces the well-established overall decrease in the reduction temperature, which indicates that the noble metal particles cause spillover of hydrogen onto the support inducing a concurrent reduction of both the metal oxide and the surface of solid solution (8). Regarding SI Table S1, it was noticed that the total amount of theH2 consumption of peak a is too large to be reasonably attributed to the reduction of noble metal oxides, the theoreticalH2 consumption of which is just 40.84 μmol/gcat, indicating the back-spillover of the oxygen process from the support to the PdO surface (28, 29). Moreover, all the Pd/CZR catalysts showed increased total H2 uptake than Pd/CZ, especially for peak a, indicating that the appearance of rare earth have an effect on the reducibility of both the solid solution and the noble metal. From what has been discussed above, we may draw a conclusion that there is a strong interaction between supports and noble metal (30), and the presence of rare earth shows a promotional effect on this interaction.
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